Removed auction_transaction

[sunce86]

In the PR we removed the auction_transaction table and added a new column auction_id to settlements table, so we need to redirect all queries to fetch the auction_id from settlements going forward.

When to merge this?

The db change is already applied to staging (migration of data from auction_transaction to settlements is also done) so we should merge the PR before the next script run on Tuesday (otherwise the accounting will try to join on <from,nonce> which are not populated anymore).

OTOH, the db change is not applied to prod yet (also it won't be applied until next script run on Tuesday), so we don't want to have this PR merged before the next script run on Tuesday.

Can we use two different versions of script for staging and prod?

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[sunce86]

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[fhenneke]

The changes look good.

As to when this should be merged: We do not have separate code for staging and production. So next payments should be run with the old code I think. This might require a correction for staging or we ignore the inconsistency there. With the next release we should include this change so that the following week is run with this PR applied.

We still plan to merge the protocol fee change before the next release. So we need to wait for the protocol fee change and adapt those queries as well.

More generally: Should we change how we handle production and staging in solver rewards? At the moment there is only one version of the code and one total payment is generated. Similar things hold for dune-sync.

[fhenneke]

I added additional changes due to new queries for protocol fees. The changes are consistent with what dune-sync does now. Most (but not all) parts of the adapted queries are just copied from from cowprotocol/dune-sync#76.

[harisang]

Looks good. Added a small comment